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Username Post: Swap a 4.3 vortec toa 5.3 or 6.0???        (Topic#192033)
BLstangin 
Member
Posts: 96

Reg: 06-16-04
06-15-08 09:07 PM - Post#1456589    

Hello all, my buddy got a 2003 chevy silverado short box standard cab, only problem is its a 4.3 vortec and has no power his dad had bought it brand new and sold it to him about a year ago. It looks real sweet but yesterday it lost all power has a p0300 code and a knock. I was looking at it and it has huge amounts of blowby out of the oil filler cap so i'm pretty sure it broke a piston. He always complained about the lack of power and since it just appears to have blown up how hard would it be to put a 5.3 or 6.0 in there??? Anyone know?? From what i've read it takes a diff trans??? Its a 2wd to, so it would make a sweet hot rod.
1970 mustang 302, 4-speed, 3.50 9" rear 1986 f-150, fuel injected 302, c-6 towing package 1979 3/4 ton, 454, TH-400, np203, 14 bolt rear, 3.73's


 
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bml2200 
Member
Posts: 449

Reg: 02-12-05
06-15-08 11:22 PM - Post#1456627    
    In response to BLstangin

It costs a lot to do a swap like you are suggesting. It is more feasible to do a 5.3 swap than a 6.0 swap. The difference alone from a 6 to a 8 cylinder will be amazing. If you do a 6.0 swap you'll need a different transmission.
Sold: 2007.5 Chevy Silverado 2500HD LMM CC/SB Z71
Twinned and built everything


 
BLstangin 
Member
Posts: 96

Reg: 06-16-04
06-16-08 06:23 AM - Post#1456730    
    In response to bml2200

O.k. so the 5.3 takes the same trans??? So i can just drop it in change all the wiring for the engine, prob exhaust maybe fuel lines?? Fan shroud, and the little stuff and it should be good to go??? I would really like to put a v8 in it for him if it won't cost an arm and a leg.
1970 mustang 302, 4-speed, 3.50 9" rear 1986 f-150, fuel injected 302, c-6 towing package 1979 3/4 ton, 454, TH-400, np203, 14 bolt rear, 3.73's


 
67suzieq 
Contributor
Posts: 128

Loc: Maple Valley, Wa
Reg: 08-03-07
06-16-08 07:53 AM - Post#1456785    
    In response to BLstangin

The 4.8, 5.3, and 6.0 v8's all have the same external dimensions and bolt patterns. You can pick up a relatively low mileage 5.3 and 4.8 for less than a $1000. Ask the guys on this website, http://www.performancetrucks.net/forums/ , they should be able to steer you to your goals. Good luck.
Tom Harris

'67 Impala
467ci, Trickflow 280cc 11:1
TH400, 3.42 gears
Lunati 241/249 .625 lift
(BBC EFI conversion in progress)


 
Randy_W 
None
Posts: 27804

Reg: 01-06-02
06-16-08 10:02 AM - Post#1456850    
    In response to BLstangin

Problems are many with this swap, the 4.3 is based on the old 350, there are many differences. Torque convertor, mounts, pcm tuning, wiring harness, exhaust, instrument interface, etc...
It's almost easier to swap a Vortec 350 in one that has a 4.3, I'm not suggesting that at all, just telling you to be prepared. You'd be better off to sell your's and buy a V8 truck from a money and effort standpoint.
Randy

DON'T mess with Old Men, we didn't get old by being, STUPID!!!

"The veneer of civilization is very thin!" (Arlo)


 
BLstangin 
Member
Posts: 96

Reg: 06-16-04
06-16-08 10:45 AM - Post#1456898    
    In response to Randy_W

So the dash won't even work??? How bout the fuse panel?? I was thinking of trying to find a totalled out one with the right combo and swap everything over. I mean these things came with 5.3 engines in them so it has to be possible. Its just how hard???
1970 mustang 302, 4-speed, 3.50 9" rear 1986 f-150, fuel injected 302, c-6 towing package 1979 3/4 ton, 454, TH-400, np203, 14 bolt rear, 3.73's


 
bml2200 
Member
Posts: 449

Reg: 02-12-05
06-16-08 11:32 AM - Post#1456936    
    In response to BLstangin

Like everyone else mentioned above, it a PITA. By the time you get all the needed parts, you'll have nickel and dimed yourself into bankruptcy.
Sold: 2007.5 Chevy Silverado 2500HD LMM CC/SB Z71
Twinned and built everything


 
BLstangin 
Member
Posts: 96

Reg: 06-16-04
06-16-08 02:42 PM - Post#1457091    
    In response to bml2200

Haha o.k. we are looking for maybe a donor truck that is totalled for whatever reason and swap absolutely everything needed over, otherwise maybe put in another 4.3, i compression tested it and cylinder 6 is only at 45psi and it knocks from that corner of the engine. Either that or i will have to rebuild it.
1970 mustang 302, 4-speed, 3.50 9" rear 1986 f-150, fuel injected 302, c-6 towing package 1979 3/4 ton, 454, TH-400, np203, 14 bolt rear, 3.73's


 
4spd409 
"7th Year" Silver Supporting Member
Posts: 534

Loc: West Fargo ND
Reg: 10-10-02
06-17-08 05:52 PM - Post#1458308    
    In response to BLstangin

Find a good used 4.3 and repair the truck and sell it and buy one with a V8. I know that dropping in a V8 sounds like the fun thing to do but as others have stated it isn't simple in these newer vehicles and it will cost you more than the solution that I pose. Good luck
61 Impala Bubbletop


 
DeLong 
Banned Member
Posts: 2868

Loc: Rural Illinois
Reg: 06-06-02
06-17-08 08:24 PM - Post#1458453    
    In response to 4spd409

I wonder what happen to it? The 4.3 is a pretty tough engine.
00 Yukon SLT XL 5.3
98 Lumina Police Package 3.8
88 2500 4X4 5.7
87 Mustang LX 5.0
67 Mustang Fastback 289
65 Mustang Fastback 289


 
BLstangin 
Member
Posts: 96

Reg: 06-16-04
06-17-08 10:19 PM - Post#1458526    
    In response to DeLong

I am not sure what happened to it. I got it torn down today and the rings were stuck on every cylinder except one. The wrist pins are extremely sticky and barely twist. There is carbon and oil deposits caked on everything which is what lead to the stuck rings i'm sure, every cylinder has light scoring, enough to need boring, but the skirts look fine on the pistons but the pistons loose in bores. The thing looks like it has 300,000 miles. The bearings have some scratches but the crank should polish up to look like new. It sounds like i'm gonna end up overhauling it as of now. I build race motors on the side and build circle track cars and drag cars so rebuilding it is a cake walk. I have a couple sbf motors on pump gas making 675 horse on an engine dyno!!! Thats why doing the swap didn't scare me at all but it sounds like we need a faster cheaper solution. Thanks guys. Oh yea it had cenex synthetic oil in it for its whole life and got a filter change at 5,000 and oil change every 10,000. I personally think that this is the cause. His dad bought it new and it has never been hot. I've known the truck myself since the first day his dad had it. Its never been abused either so only thing i can think of is the oil and the prolonged changes which his dad swore by because he sells the stuff.
1970 mustang 302, 4-speed, 3.50 9" rear 1986 f-150, fuel injected 302, c-6 towing package 1979 3/4 ton, 454, TH-400, np203, 14 bolt rear, 3.73's


 
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